Set min-height for menu item title. Add a fallback for empty-titled items.

props philiparthurmoore.
fixes #30283.

git-svn-id: https://develop.svn.wordpress.org/trunk@30500 602fd350-edb4-49c9-b593-d223f7449a82
Replace invalid use of ltrim() in attachment_url_to_postid() with substr().

props bradyvercher.
fixes #30346.

git-svn-id: https://develop.svn.wordpress.org/trunk@30501 602fd350-edb4-49c9-b593-d223f7449a82
Convert `<title>` to "title tag" in the DocBlock summary for the `admin_title` hook.

Fixes #30437.


git-svn-id: https://develop.svn.wordpress.org/trunk@30502 602fd350-edb4-49c9-b593-d223f7449a82